Lots of people say you should skip season one of Star Trek: Discovery, but it was my favourite, and set up the themes and characterisation that carries over seasons 2 and 3.

And I was warned that the first season of Schitt's Creek wasn't very good, but I liked it a lot -- it's true that the ensuing seasons are funnier, but I needed that foundation of getting to know the characters. And it was good, just not outstanding.